City of Mount Vernon

Sewer utility with combined sewers · Washington · Mount Vernon

Map sources: water outlines and launches from OpenBoatLaunch and OpenStreetMap contributors (Open Database License); wastewater outlets from EPA and state records; downstream estimates by DirtyWaterWatch using U.S. Geological Survey maps and flow data. Base map: OpenFreeMap and OpenMapTiles.

Solid dots mark combined sewer outfalls. Ringed dots mark treatment plant outfalls. Grey dots are closed outfalls. Square boat markers mark boat launches listed by OpenBoatLaunch.

Federal wastewater discharge permit (NPDES): WA0024074
Wastewater outlets: 4 combined sewer outfalls and 1 treatment plant outfall listed by EPA or state agencies (the state's combined sewer records list 5) · List
Waters listed as receiving wastewater: Skagit River
Tracked waters: Skagit River, WA
Discharge records counted: 0 records
Total reported volume in these records: No numeric volumes are available in these tracked records.

These totals reflect the records we track. Missing volumes and gaps in reporting limit comparisons between operators.

Sources: EPA ECHO and the operator and state sources linked below. Counts use the discharge records on this page. Updated 2026-11-06 06:13 UTC.

Public notices and alerts

Pages where City of Mount Vernon or the state publishes its notices (check them for an alert sign-up):

ecology.wa.gov/water-shorelines/water-quality/wastewater/sewage-spills

Its public-notice channels

Operator's notice page · Required by a permit (WA0024074)
CSO public notification not read

NPDES permit WA0024074: CSO public notification, one of the nine minimum controls of the federal CSO Control Policy (59 FR 18688, 1994), with WAC 173-245 for CSO reduction and reporting; permit text not read
State alert page · Required by a permit (WA0024074)
Read as a feed

Individual permit WA0024074: the permittee reports each spill to Ecology under the permit's noncompliance notification (permit text not read); RCW 90.48.636(1): Ecology "must post on the website notice of the reported sewage spill" for every sewage spill "reported to the department under individual water quality permits for discharges that contain sewage"

Source: City of Mount Vernon's public notice and alert pages and the state's notification records; DirtyWaterWatch register of public-notice channels and its page monitor.

Report a missing notice or error

Wastewater outlets

Outfall: a pipe or outlet where wastewater enters a water body.

4 combined sewer outfalls and 1 treatment plant outfall listed by EPA or state agencies.

Combined sewer outfalls

4 outfalls · 4 closed

Outfall 002 · receiving water in the permit: Skagit River · Skagit River, WA · closed
Outfall 003 · receiving water in the permit: Skagit River · Skagit River, WA · closed
Outfall CSO2 · receiving water in the permit: Skagit River · Skagit River, WA · closed
Outfall CSO3 · receiving water in the permit: Skagit River · Skagit River, WA · closed

Source: U.S. Environmental Protection Agency (EPA) national combined sewer outfall inventory (ECHO) and state outfall layers. Open or closed as EPA's inventory lists it. DirtyWaterWatch links outlets to waters using permit numbers, locations and names.

Treatment plant outfalls

1 outfall

Outfall 004 · Skagit River, WA · status not published

Source: U.S. Environmental Protection Agency (EPA) permit records (ICIS-NPDES permitted features): where a treatment plant’s permitted discharge leaves. No national source says whether a plant outfall is open or closed.

Reports and advisories

No reports are linked to this operator yet.

Other sewer operators on these waters

Skagit River, WA: City of Burlington, City of Sedro-Woolley, Seattle City Light (Skagit project camps), Skagit County Sewer District No. 2 (Big Lake)

The last 90 days

Last 90 days, hour by hour. Red: discharge or advisory reported. Amber: caution. Hatched amber: end not confirmed. Plum: algal bloom advisory. Red or amber with a light line inside: beach advisory or caution. Dotted: monthly report (days with discharge, dates not given). Grey: no current status on the water outline. Purple hatching: a status resting on a source that could not be checked on schedule.

No discharge, advisory or caution periods are shown for the waters this sewer operator's reports were placed on in this time span. Check downstream stretches and source coverage.

Source: DirtyWaterWatch calculations using the reports named above and the published status rules. Updated 2026-11-06 06:13 UTC.

Reported discharges over time

Historical charts are not available here. See the reports and sources on this page.